Perform string add in generated code on IA-32 platforms...

src/arm/codegen-arm.cc

Index: src/arm/codegen-arm.cc
===================================================================
--- src/arm/codegen-arm.cc	(revision 3397)
+++ src/arm/codegen-arm.cc	(working copy)
@@ -3505,6 +3505,17 @@
 }
 
 
+void CodeGenerator::GenerateStringAdd(ZoneList<Expression*>* args) {
+  ASSERT_EQ(2, args->length());
+
+  Load(args->at(0));
+  Load(args->at(1));
+
+  frame_->CallRuntime(Runtime::kStringAdd, 2);
+  frame_->EmitPush(r0);
+}
+
+
 void CodeGenerator::GenerateObjectEquals(ZoneList<Expression*>* args) {
   VirtualFrame::SpilledScope spilled_scope;
   ASSERT(args->length() == 2);